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Real Estate Investments Acquisitions and Dispositions (Details) (USD $) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Jan. 08, 2015 property | Apr. 09, 2015 sqft | Apr. 24, 2015 sqft property
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Net gain on disposition of real estate | $ 9,019,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | $ 0 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal |  |  |
Provision for impairment on assets held for sale | 1,726,000 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf | 0 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf |  |  |
1000 Atrium Way and Libertyview [Member] |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Number of Real Estate Properties |  |  | 2 us-gaap_NumberOfRealEstateProperties / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_A1000AtriumWayandLibertyviewMemberMember |  |
Sale Consideration Of Sold Property |  |  | 28,300,000 bdn_SaleConsiderationOfSoldProperty / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_A1000AtriumWayandLibertyviewMemberMember |  |
Net gain on disposition of real estate | 9,000,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_A1000AtriumWayandLibertyviewMemberMember |  |  |  |
1000 Atrium Way [Member] |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Net Rentable Space Sold |  |  | 99,668 bdn_NetRentableSpaceSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_A1000AtriumWayMember |  |
Libertyview [Member] |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Net Rentable Space Sold |  |  | 121,737 bdn_NetRentableSpaceSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_LibertyviewMember |  |
Lake Merritt Tower [Member] |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Provision for impairment on assets held for sale | 1,700,000 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_LakeMerrittTowerMember |  |  |  |
Delaware Corporate Center I & II [Member] |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Number of Real Estate Properties | 2 us-gaap_NumberOfRealEstateProperties / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_DelawareCorporateCenterIIIMember |  |  |  |
Net Rentable Area | 200,275 us-gaap_NetRentableArea / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_DelawareCorporateCenterIIIMember |  |  |  |
Christiana Corporate Center [Member] |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Number of Real Estate Properties | 3 us-gaap_NumberOfRealEstateProperties / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_ChristianaCorporateCenterMember |  |  |  |
Net Rentable Area | 284,907 us-gaap_NetRentableArea / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_ChristianaCorporateCenterMember |  |  |  |
Subsequent Event [Member] | Lake Merritt Tower [Member] |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Net Rentable Area |  |  |  | 204,336 us-gaap_NetRentableArea / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_LakeMerrittTowerMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Sales of Real Estate |  |  |  | $ 65,000,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_LakeMerrittTowerMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Subsequent Event [Member] | Delaware Corporate Center I & II [Member] |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Number of Real Estate Properties |  |  |  |  | 2 us-gaap_NumberOfRealEstateProperties / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_DelawareCorporateCenterIIIMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Net Rentable Area |  |  |  |  | 200,275 us-gaap_NetRentableArea / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_DelawareCorporateCenterIIIMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event [Member] | Christiana Corporate Center [Member] |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Number of Real Estate Properties |  |  |  |  | 3 us-gaap_NumberOfRealEstateProperties / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_ChristianaCorporateCenterMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Net Rentable Area |  |  |  |  | 284,907 us-gaap_NetRentableArea / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdn_ChristianaCorporateCenterMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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